@Gary P posted:gunrunnerjohn, could you please give me the Digi-Key part # of the Supercap that you would recommend to replace the 8.4 volt rechargeable battery for the early PS2 5 Volt MTH Locomotive? It would be greatly appreciated. Thank you in advance. Thanks for all the help you give everyone here on the forum.
Well, you need two of the 5V supercaps for the old 5V boards.
This is the one I use, the AVX SCMR22C155PRBA0, you can get it at Mouser.com.